Fix is to download AVAST.EXE.you can download AVAST.EXE from here.
After downloading the S/W run it and install it.After the installation it will ask to do a boot upscan.Chose Yes and restart your machine.When the PC is started it will prompt to scan and will start by scanning your C:/ Drive.If you are not sure about any file do not delete any especially files in Windows or Program files.You can move them to the chest and continue with the rest.Remember scanning can take a while.So my advice for you is to wait till it finishes the C:\ drive and escape the scan and statup Windows.Then do a manual scanning on the rest of the drives and your done with the intruders.
Also it is recommended that you clean any spyware on your machine.You can do it by downloading Spyware Doctor.I have some keys with me.Contact me if you need them.
Cheers